Full list of all 59 Still Wakes the Deep achievements. It takes around 8-10 hours to unlock all of the achievements in the base game on Windows.
The base game contains 37 achievements, and there is 1 DLC pack containing 22 achievements.
Found your first Memento linked to the Beira D crew
Find a significant number of Mementos left by the Beira D crew
Find all the Mementos you can of the lost Beira D crew
Follow the flickering flare down to the bottommost layer
Sink into the gaping bowels of the North Sea
Thoroughly explore the sea floor
Found your first set of human remains from the Beira D crew
Found a significant amount of human remains from the Beira D crew
Found all the human remains from the Beira D crew that you can
Thoroughly explore the trench valley